IL6 and breast cancer: Other inflammatory/immune-stimulating reagents, including lipopolysaccharide (LPS), Pam3Cys (Pam), peptidoglycan (PGN), CpG, and bleomycin (BLM), did not induce IL-6 expression in either MCF7_Cont or MCF7_TG2 breast cancer cells (Additional file 1: Figure S2).